Move source to src.

src/seesaw.h

@@ -0,0 +1,51 @@
+// -*- C++ -*-
+
+#ifndef MBOSTOCK_SEESAW_H
+#define MBOSTOCK_SEESAW_H
+
+#include "model.h"
+#include "physics/force.h"
+#include "physics/particle.h"
+#include "physics/shape.h"
+#include "physics/vector.h"
+#include "room_object.h"
+
+namespace mbostock {
+
+  class Material;
+
+  class Seesaw : public DynamicRoomObject {
+  public:
+    Seesaw(const Vector& min, const Vector& max, float mass);
+
+    virtual Model& model();
+    virtual const Shape& shape() const;
+    virtual void resetForces();
+    virtual void applyForce(UnaryForce& force);
+    virtual void applyWeight(float w, const Vector& x);
+    virtual void step(const ParticleSimulator& s);
+    virtual void constrainInternal();
+    virtual void reset();
+    virtual float slip() const;
+
+    void setMaterial(const Material& m);
+    void setTopMaterial(const Material& m);
+
+  private:
+    void updateBox();
+
+    const Vector origin_;
+    const Vector size_;
+    LinearDragForce drag_;
+
+    Box box_;
+    Particle left_;
+    Particle right_;
+    Particle center_;
+
+    BoxModel model_;
+  };
+
+}
+
+#endif